The revised 1992 manual states:-
Any two-star grade of leaded or unleaded petrol (octane 96/97) may be used.
The petrol is mixed with 2% (50:1) Super Outboard Oil (BIA-BIN's
TC-W-N quality) which is ash-free.

If standard 2-stroke oil is being used a mixture of 3% (33:1)is
recommended.

Early Vire engines with an engine number below 22,000 always
require a mixture of 3% (33:1) , if the engine has not been modified
to the new standard.

Webmaster's Note: See the Bulletin Board for
discussion and explanation.

2-stroke (2-cycle) Super Outboard Oil (BIA Type TC-W) (mixed
in fuel). To ensure proper dispersal, it is recommended that the fuel
and oil are mixed in a can and the mixture is then poured into the boat's
fuel tank.

Webmaster's Note: The original European Operator's Manual variously
recommends 0.7 or 0.85 litres. The American version recommends 1.75 pints
(0.85 litres). Experience suggests that the Americans are right and that
too much is better than too little.